Rotate Font Awesome Icons

I am wondering if there’s a way to rotate Font Awesome icons. E.g. I was using this tool: administrator/index.php?option=com_azurapagebuilder&view=page&layout=edit&id=1 in the Momentum template.

This link: speaks to what I am trying to accomplish

So … In the “Branding” area of Azura Page Builder, I tried adding this: “.fa-rotate-90” to the field: Additional CSS Style. I also tried “fa-rotate-90” [ no period ], but NO STYLES are showing up around the icon. I just see this, e.g.

I thought I would see this:

but no luck